<template>
  <view>
    <!-- 使用自定义组件-->
    <my-search @click="gotoSearch"></my-search>
    
    
 <view class="scroll-view-container">
   <!-- 左侧的滑动区域-->
   <scroll-view class="left-scroll-view" scroll-y="true"  :style="{height: wHeight+'px'}">
     <block v-for="(item,i) in cateList":key='i'>
       <view :class="['left-scroll-view-item',i===active?'active':'']" @click="activeChanged(i)">{{item.cat_name}}</view>
     </block>

     
    
   </scroll-view>
   
   <!-- 右侧的滑动区域-->
   <scroll-view class="right-scroll-view" scroll-y="true"  :style="{height: wHeight+'px '}" :scroll-top="scrollTop">
  <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
    <!-- 二级分类的标题-->
      <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
      <!-- 当前二级分类下的三级分类列表-->
      <view class="cate-lv3-list">
        <!-- 三级分类的item项-->
        <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key='i3' @click="gotogoodslist(item3)">
          <!-- 三级分类的图片-->
          <image :src="item3.cat_icon"></image>
          <text>{{item3.cat_name}}</text>
        </view>
      </view>
    </view>

   </scroll-view>
   </view>
</view>
</template>


<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
     mixins:[badgeMix],
    data() {
      return {
        /* 当前设备可用高度*/
        wHeight:0,
        cateList:[],
        active:0,
        /* 二级分类列表*/
        cateLevel2:[],
        scrollTop:0
      };
    }, 
    onLoad() {
      const sysinfo =uni.getSystemInfoSync()
     
        this.wHeight=sysinfo.windowHeight-50
        this.getcateList()
    },
    methods:{
      /* 获取分类列表的数据*/
    async  getcateList(){
      const{data:res} = await uni.$http.get('/api/public/v1/categories')
       // 判断是否获取失败
      if(res.meta.status!==200)
      return uni.$showMsg()
         // 转存数据
      this.cateList=res.message
      
      /* 为二级分类赋值*/
      this.cateLevel2=res.message[0].children
      },
      
      /* 切换一级分类*/
      activeChanged(i){
        this.active=i
        
        /* 重新为二级分类赋值*/
       this.cateLevel2= this.cateList[i].children
       this.scrollTop=this.scrollTop===0?1:0
      },
      
      /* 跳转到商品列表页面*/
      gotogoodslist(item3){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' + item3.cat_id
        })
      },
      //搜索方法，导航到搜索页面
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
      
    }
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  .left-scroll-view{
    width: 120px;
    .left-scroll-view-item{
      background-color: #F7F7F7;
      line-height: 60px;
      text-align: center;
      font-size: 12;
      &.active{
        background-color: #FFFFFF;
        position: relative;
        &::before{
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          position: absolute;
          top:50%;
          left:0%;
          transform: translateY(-50%);
        }
      }
    }
  }
}
.cate-lv2-title{
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list{
  display: flex;
  flex-wrap:wrap;
  .cate-lv3-item{
    width: 33.33%;
    display: flex;
    flex-direction: column;  //纵向布局
    align-items: center;  //横向居中
    justify-content: center; //纵向居中
    margin-bottom: 10px;
    image{
      width: 60px;
      height: 60px;
    }
    text{
      font-size: 12px;
    }
  }
}
</style>
